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  • Feldspar - ALEX STREKEISEN
    This diagram shows how feldspar minerals are classified on the basis of their chemical composition The sequence of minerals along the base of the triangle represents the solid solution series of plagioclase between albite and anorthite
  • ALEX STREKEISEN-Alkalifeldspar-
    This diagram shows how feldspar minerals are classified on the basis of their chemical composition The sequence of minerals along the base of the triangle represents the solid solution series of plagioclase between albite and anorthite
  • K-feldspar - University of North Dakota
    The three principle varieties of K-feldspar are microcline (low temperature), orthoclase (medium temperature), sanidine (high temperature) Other, rare, related feldspar varieties include adularia and anorthoclase
  • Feldspar - Mineral Composition, Uses, Types | Britannica
    The most obvious differences between the high- and low-temperature diagrams are along the alkali-feldspar (Or-Ab) join (the boundary line between the phases) As indicated, sanidine and anorthoclase are high-temperature alkali feldspars, and perthite is their low-temperature analogue
  • Tectosilicates - GeoClassroom
    Sanidine, Microcline and Plagioclase have characteristic twinning which helps distinguish them Sanidine typically shows the Carlsbad Twin law: Microcline shows a characteristic cross hatched twinning that results from the Al-Si ordering upon cooling
  • Search - 6. 4. 3: Feldspars - Geosciences LibreTexts
    Sanidine forms in high temperature rocks; orthoclase and microcline form in lower temperature rocks (Figure 6 42) Sanidine commonly crystallizes from silicic lava but may change into orthoclase and, perhaps, microcline if the lava cools relatively slowly
  • Alkali Feldspar - an overview | ScienceDirect Topics
    Sanidine (K, Na) (AlSi 3 O 8) is the monoclinic high-temperature alkaline K-Na feldspar, which usually contains about 30%, but sometimes up to 62% sodium (Ab) component It is found only in young volcanic discharges or volcanic rocks (rhyolite, trachyte, and dacite)
  • Distinguishing the Feldspars - Steve Dutch
    Albite (0-10% anorthite) is found mostly in very Na-rich environments It forms from more anorthite-rich plagioclase by ion-exchange with sea water, and as an authigenic mineral in marine sedimentary rocks
  • Feldspar - Wikipedia
    Solid solutions between albite and anorthite are called plagioclase, [14] or, more properly, plagioclase feldspar Only limited solid solution occurs between K-feldspar and anorthite, and in the two other solid solutions, immiscibility occurs at temperatures common in the crust of the Earth
  • The Feldspar Compositional Ternary Diagram - Chemostratigraphy. com
    At high temperatures (≥ 1000 °C), a solid solution exists between NaAlSi 3 O 8 and KAlSi 3 O 8 Nevertheless, a change in the symmetry between triclinic anorthoclase (Ab100 to Ab63) and monoclinic sanidine (Ab63 to Ab0) occurs





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